<template>
    <el-table :data="formatData" :row-style="showRow" v-bind="$attrs">
        <el-table-column align="left">
            <template slot-scope="scope">
                <span v-for="space in scope.row._level" :key="space" class="ms-tree-space"/>
                <span v-if="iconShow(0,scope.row)" class="tree-ctrl" @click="toggleExpanded(scope.$index)">
                    <i v-if="!scope.row._expanded" class="el-icon-caret-right ms-treetable-icon"/>
                    <i v-else class="el-icon-caret-bottom ms-treetable-icon"/>
                </span>
                <span v-else><i class="fa fa-circle-o ms-treetable-icon"></i></span>

                {{ scope.row[rowKey] }}
                <!--{{ scope.$index }}-->
            </template>
        </el-table-column>

        <!--
        <el-table-column v-for="(column, index) in columns" :key="column.prop" :label="column.label" :width="column.width">
            <template slot-scope="scope">
                <span v-for="space in scope.row._level" v-if="index === 0" :key="space" class="ms-tree-space"/>
                <span v-if="iconShow(index,scope.row)" @click="toggleExpanded(scope.$index)">
                    <i v-if="!scope.row._expanded" class="el-icon-caret-right ms-treetable-icon"/>
                    <i v-else class="el-icon-caret-bottom ms-treetable-icon"/>
                </span>
                <span v-else-if="index===0"><i class="fa fa-circle-o ms-treetable-icon"></i></span>

                <span class="tree-ctrl">
                    <span v-if="index === 0"><i :class="scope.row.icon"></i></span>
                    <span style="padding-left: 5px;">{{ column.formatter ? column.formatter(scope.row,column.prop,scope.row[column.prop],scope.$index) : scope.row[column.prop] }}</span>
                </span>
            </template>
        </el-table-column>
        -->

        <slot/>

    </el-table>
</template>

<script>

  import treeToArray from './tree'

  export default {
    props: {
      data: {
        type: [Array, Object],
        required: true
      },
      rowKey: {},
      /*columns: {
          type: Array,
          default: () => []
      },*/
      evalFunc: Function,
      evalArgs: Array,
      expandAll: {
        type: Boolean,
        default: false
      }
    },
    computed: {
      // 格式化数据源
      formatData: function () {
        let tmp = this.data

        /*const func = this.evalFunc || treeToArray;
        const args = this.evalArgs
            ? Array.concat([tmp, this.expandAll], this.evalArgs)
            : [tmp, this.expandAll];
        func.apply(null, args);*/

        return treeToArray(tmp, false)
      }
    },
    methods: {
      showRow: function (row) {
        /*const show = row.row.parent
            ? row.row.parent._expanded && row.row.parent._show
            : true;
        row.row._show = show;*/

        let show = false
        var isRoot = row.row.parent
        if (!isRoot) {
          show = row.row._show
        } else {
          //console.log(row.row.resource_name + ",parentShow:" + row.row.parent._show + ",expand:" + row.row.parent._expanded + ",show:" + row.row._show);
          show = row.row.parent._show && row.row.parent._expanded && row.row._show
        }

        /*const show = (row.row.parent)
            ? row.row.parent._show && row.row._show
            : true;*/

        //let show = (row.row._show && row.row.parent._show);
        /*let isRoot = typeof(row.row.parent) == "undefined";
        if(isRoot){
            show = true;
        }else{
            show = row.row._show;
            //show = (row.row._show && row.row.parent._expanded && row.row.parent._show);
        }*/

        return show
          ? 'animation:treeTableShow 1s;-webkit-animation:treeTableShow 1s;'
          : 'display:none;'
      },
      // 切换下级是否展开
      toggleExpanded: function (trIndex) {
        const record = this.formatData[trIndex]
        record._expanded = !record._expanded

        record.children.forEach(item => {
          item._show = !item._show
        })
      },
      // 图标显示
      iconShow (index, record) {
        return index === 0 && record.children && record.children.length > 0
      },

      // 添加节点
      append (data, parentRow) {

        if (!parentRow._level) {
          this.$set(parentRow, '_level', 0)
        }

        if (!parentRow.children) {
          this.$set(parentRow, 'children', [])
        }

        this.$set(data, '_show', true)
        this.$set(data, '_expanded', false)
        this.$set(data, '_level', parentRow._level + 1)
        this.$set(data, 'children', [])
        var children = parentRow.children.push(data)

        this.$set(parentRow, '_expanded', true)
      },

      // 更新节点
      update (row) {
        function internalUpdate (children) {
          children.forEach(item => {
            if (row.id == item.id) {
              Object.assign(item, row)
              return
            }

            internalUpdate(item.children || [])
          })
        }

        if (row.parent) {
          internalUpdate(row.parent.children)
        } else {
          internalUpdate(this.data)
        }
      },

      // 删除节点
      remove (row) {
        //row._show = false;
        //row.$set(row, 'resource_name' , 'delete');
        if (row.parent) {
          var children = row.parent.children
          var index = 0
          children.forEach(item => {
            if (row.id == item.id) {
              children.splice(index, 1)
            }
            index++
          })
        } else {
          var index = 0
          this.data.forEach(item => {
            if (row.id == item.id) {
              this.data.splice(index, 1)
            }
            index++
          })
        }
      },

      // 显示节点
      show (row, isVisible) {

      },

      // 搜索节点
      filter (key, val) {
        function search (key, val, list) {
          if (!list) return

          // 没有值的情况
          if (!val) {
            list.forEach(item => {
              item._show = true

              if (item.parent) {
                item._show = item.parent._show && item.parent._expanded
              }

              if (item.children) {
                search(key, val, item.children)
              }
            })
          } else {
            list.forEach(item => {
              var isFind = false
              key.forEach(v => {
                if (item[v].indexOf(val) != -1) {
                  isFind = true
                }
              })
              if (isFind) {
                item._show = true
                var parent = item.parent
                while (parent) {
                  parent._show = true
                  parent._expanded = true
                  parent = parent.parent
                }

                // 找到并且存在子节点，收起来
                if (item.children) {
                  item._expanded = false

                  function expanded (list) {
                    if (!list) return
                    list.forEach(item => {
                      item._expanded = false
                      expanded(item.children)
                    })
                  }

                  expanded(item.children)
                }
              } else {
                item._show = false
                //item._expanded = false;
              }

              search(key, val, item.children)
            })
          }
        }

        search(key, val, this.data)
      },

      delExtAttr (obj) {
        delete obj._expanded
        delete obj._level
        delete obj._show
        delete obj.children
        delete obj.leaf
        delete obj.parent
        return obj
      }
    }
  }
</script>
<style rel="stylesheet/css">
    @keyframes treeTableShow {
        from {
            opacity: 0;
        }
        to {
            opacity: 1;
        }
    }

    @-webkit-keyframes treeTableShow {
        from {
            opacity: 0;
        }
        to {
            opacity: 1;
        }
    }
</style>

<style scoped>
    .ms-tree-space {
        position: relative;
        top: 1px;
        display: inline-block;
        font-style: normal;
        font-weight: 400;
        line-height: 1;
        width: 18px;
        height: 14px;
    }

    .ms-tree-space::before {
        content: "";
    }

    .ms-treetable-icon {
        color: #606266 !important;
        padding: 0 5px;
        cursor: pointer;
    }

    .processContainer {
        width: 100%;
        height: 100%;
    }

    table td {
        line-height: 26px;
    }

    .tree-ctrl {
        color: #606266; /*#2196f3;*/
    }
</style>
